jes are 
)S 
tography 
lera or 
Loto 
o the 
al 
x 19 cm 
"e or 
) 
ises of 
Logical 
xistics 
imagery 
- 1399 - 
— which can be observed stereoscopically 
— of à relatively large scale 
— with à good resolution 
— with à good geometry. 
Table II illustrates the applicability of the various remote sensing 
techniques during the different phases of engineering geological 
investigations. : 
  
Photography Mulsispocteal Radar 
; ; 8 
Satellite! Aerial) Terrestrial | Satellite! Aerial | Aerial | Aerial 
| 
1 
PROJECT PHASE Thermography 
  
| 
Preliminary } 
investigation | 
(for project M x 0/+ 
conception) | 
I 
--+----- € + tem 
Reconnaissance 
I 
: ies ++ | 0 = 
investigation | 
| 
Main 
investigation 
+ 
1 
| 
| 
| 
| 
---ili---Lli------- 
Construction 
I 
| 
| 
| 
| 
| 
| 
À 
| 
| 
| 
| 
€-——T —— ----4---4---d ——— —— oo 
| 
I 
| 
| 
-i 
| 
* * * | 
investigation | 
| 
Operation and 
maintenance - 
investigation 
meet Lese 
  
  
  
  
| 
| 
| 
| 
| 
| 
| 
+ 
| 
| 
| 
| 
I 
| 
| 
| 
| 
T 
| 
| 
| 
i 
| 
| 
| 
| 
| 
L 
- inadequate 
0 oflimited use 
* useful 
++ very useful 
Table II : Summary of applicability of various remote sensing 
techniques in the different engineering geological 
investigation phases. 
10. Acknowledgement 
Discussions with my colleagues Hempenius, Mekel and Soeters 
contributed considerably to the contents and form of this paper. 
Their help and encouragement is thankfully acknowledged.